🎨 Format files with pre-commit and Ruff (#611)

src/backend/app/schemas/item.py

@@ -1,12 +1,10 @@
-from typing import Optional
-
 from pydantic import BaseModel
 
 
 # Shared properties
 class ItemBase(BaseModel):
-    title: Optional[str] = None
-    description: Optional[str] = None
+    title: str | None = None
+    description: str | None = None
 
 
 # Properties to receive on item creation